Phoenix Contact REL-MR-BL-12DC/21-21 Single Relay – 12 V DC Coil, 2 Changeover Contacts (DPDT), Plug-in Miniature Power Relay (Item 1109543)

Detailed Description:

The Phoenix Contact REL-MR-BL-12DC/21-21 (Item No. 1109543) is a robust plug-in miniature power relay designed for industrial automation, control-panel installations and various switching applications. Engineered as a single-module unit with two changeover (DPDT) contacts, this relay features a 12 V DC nominal coil voltage, a monostable drive and broad input voltage tolerance from 8.4 V DC to 27 V DC. 

Key Specifications & Features:

• Coil: 12 V DC nominal, non-polarised drive, typical coil current ~33.3 mA at 12 V.

• Contact configuration: 2 changeover contacts (DPDT) – enables switching two separate circuits. 

• Contact ratings: Limiting continuous current 8 A; maximum inrush current 12 A for 20 ms. Maximum switching voltage 250 V AC/DC.

• Mechanicals & durability: Mechanical service life up to 3×10⁷ cycles; designed for 100% operating factor. 

• Dimensions & mounting: Approx. width 12.7 mm, height 29 mm, depth 15.7 mm; uses plug/solder connection method, suitable for plug-in mounting. phoenixcontact.com+1

• Environmental rating: Operating temperature from –40 °C to +85 °C; insulation rated to 250 V AC; overvoltage category III; pollution degree 3. phoenixcontact.com+1

Typical Applications:
This relay is ideal when you need reliable switching of two circuits in compact installations — for example:

• In control cabinets linking PLC outputs to higher-power loads

• Automation machinery where space is limited but a dual-changeover relay is needed

• Replacement of standard miniature relays in industrial panels

Why Choose This Relay?
With a 12 V DC coil standard for many industrial control systems, dual changeover contacts (DPDT) for versatility, a compact form-factor that saves panel space, and durability built for demanding installations, the REL-MR-BL-12DC/21-21 delivers a solid combination of performance and reliability from a well-regarded manufacturer.

Scope of Delivery:
One (1) Phoenix Contact REL-MR-BL-12DC/21-21 relay module (Item No. 1109543), as described.

Installation & Use Notes:

• Confirm compatibility of the 12 V DC coil with your control circuit voltage.

• Ensure correct mounting and connection method (plug/solder) as specified.

• Use in environments consistent with the ambient temperature and insulation ratings provided.

• For higher inrush loads or special duty types check the full datasheet for life-expectancy curves.

Manufacturer / Item Number: Phoenix Contact – Item No. 1109543.